Rust std mpsc 发送者通道在闭包中使用时关闭

我正在try 创建一个线程来监视铁 rust 中的文件更改.我正在使用notify crate 来获取文件更改事件.

下面的代码显示了监视线程中运行的内容:

use std::{path::PathBuf, thread};

use log::{error, info};
use notify::Watcher;

fn main() {
    env_logger::init();

    let (tx, rx) = std::sync::mpsc::channel();

    thread::spawn({
        let config_path = PathBuf::from("config.toml");

        move || {
            let mut watcher =
                notify::recommended_watcher(move |res: Result<notify::Event, notify::Error>| {
                    match res {
                        Ok(event) => match event.kind {
                            notify::event::EventKind::Modify(notify::event::ModifyKind::Data(
                                notify::event::DataChange::Any,
                            )) => {
                                info!("Reloading config file");
                                tx.send(true).ok();
                            }
                            _ => (),
                        },
                        Err(e) => {
                            error!("Notify Error: {}", e);
                        }
                    }
                })
                .unwrap();
            watcher.watch(&config_path, notify::RecursiveMode::NonRecursive)
        }
    });

    loop {
        match rx.recv() {
            Ok(_) => {
                // reload config
            }
            Err(e) => {
                error!("Error while watching config file: {}", e);
                break;
            }
        }
    }
}

# Cargo.toml

[dependencies]
env_logger = "0.10.0"
log = "0.4.19"
notify = "6.0.1"

问题是，当我try 从通道接收时，我得到了输出Error while watching config file: receiving on a closed channel.

我期望发送器tx在不关闭通道的情况下移动到封闭器中.但不知何故，它被关闭了.

我已经判断了known problems个通知箱，但我认为没有任何与我的问题有关的.